[NTG-context] Headers must not be the last object on the page

I'm getting headers as the last item on a page. Following content appears on the next page. I would like to have headers not be separated from their content by a page break. Is there a way to say "if a header is the last thing on the page, place it on the next page instead"? I am aware of the "before={\testpage[n]\blank}" trick, but this only applies when you need a specific amount of lines. Because the following content may be a figure, float, table, or other large object, the space required will vary. I just want the header to know that it must not be the last object on the page. Is this possible? Thank you very much for your help.